masslogger | 6e4fa34445f2439fe41ba7df0502aad79728646a2138b264e5945c9c980794ce

General

Target

PO__2001.exe
Size

1.2MB
MD5

5023566d205bcc7958ccbc84be950e9d
SHA1

4f7f6f3ad838506c5b141537f413eb341bf17027
SHA256

b88b1caee334cbd27f17d4310f2b51c26a5a9411452ad2f4b7fa17e1e81b59fb
SHA512

732c033c5c38464f2255e964054d1e4d727cd31f7c64817d9a29e3d44da30583c2e552646f7fbc4a37e4662a4457c2c40abd1ee95d80ddd84e62b20e004deaa6

Score

10^/10

masslogger collection ransomware spyware stealer

Malware Config

Extracted

Path

C:\Users\Admin\AppData\Local\Temp\2EF8342664\Log.txt

Family

masslogger

Ransom Note

################################################################# MassLogger v1.3.7.0 ################################################################# ### Logger Details ### User Name: Admin IP: 154.61.71.50 Location: United States Windows OS: Microsoft Windows 10 Pro64bit Windows Serial Key: W269N-WFGWX-YVC9B-4J6C9-T83GX CPU: Intel Core Processor (Broadwell) GPU: Microsoft Basic Display Adapter AV: NA Screen Resolution: 1280x720 Current Time: 5/21/2022 6:12:21 AM MassLogger Started: 5/21/2022 6:12:09 AM Interval: 2 hour MassLogger Process: C:\Users\Admin\AppData\Local\Temp\RegAsm.exe MassLogger Melt: true MassLogger Exit after delivery: false As Administrator: True Processes:

Signatures

MassLogger
Masslogger is a .NET stealer targeting passwords from browsers, email and cryptocurrency clients.
stealer spyware masslogger

MassLogger Main Payload 2 IoCs

Processes:

resource	yara_rule
behavioral2/memory/2136-130-0x0000000000EB0000-0x0000000000FF2000-memory.dmp	family_masslogger
behavioral2/memory/3472-136-0x0000000000400000-0x00000000004A8000-memory.dmp	family_masslogger

MassLogger log file 1 IoCs
Detects a log file produced by MassLogger.

Processes:

yara_rule

masslogger_log_file
Executes dropped EXE 1 IoCs

Processes:

RegAsm.exe

pid process

3472 RegAsm.exe
Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.

Query Registry
T1012

System Information Discovery
T1082

Processes:

RegAsm.exe

description ioc process

Key value queried \REGISTRY\USER\S-1-5-21-3751123196-3323558407-1869646069-1000\Control Panel\International\Geo\Nation RegAsm.exe
Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials in Files
T1081

yara_rule
masslogger_log_file

pid	process
3472	RegAsm.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-3751123196-3323558407-1869646069-1000\Control Panel\International\Geo\Nation	RegAsm.exe

Accesses Microsoft Outlook profiles 1 TTPs 18 IoCs

collection

Email Collection

T1114

Processes:

RegAsm.exe

description	ioc	process
Key queried	\REGISTRY\USER\S-1-5-21-3751123196-3323558407-1869646069-1000\SOFTWARE\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	RegAsm.exe
Key opened	\REGISTRY\USER\S-1-5-21-3751123196-3323558407-1869646069-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	RegAsm.exe
Key created	\REGISTRY\USER\S-1-5-21-3751123196-3323558407-1869646069-1000\SOFTWARE\Microsoft\Office\16.0\Outlook\Profiles\Outlook	RegAsm.exe
Key created	\REGISTRY\USER\S-1-5-21-3751123196-3323558407-1869646069-1000\SOFTWARE\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	RegAsm.exe
Key queried	\REGISTRY\USER\S-1-5-21-3751123196-3323558407-1869646069-1000\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook	RegAsm.exe
Key created	\REGISTRY\USER\S-1-5-21-3751123196-3323558407-1869646069-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	RegAsm.exe
Key queried	\REGISTRY\USER\S-1-5-21-3751123196-3323558407-1869646069-1000\SOFTWARE\Microsoft\Office\15.0\Outlook\Profiles\Outlook	RegAsm.exe
Key created	\REGISTRY\USER\S-1-5-21-3751123196-3323558407-1869646069-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	RegAsm.exe
Key created	\REGISTRY\USER\S-1-5-21-3751123196-3323558407-1869646069-1000\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook	RegAsm.exe
Key created	\REGISTRY\USER\S-1-5-21-3751123196-3323558407-1869646069-1000\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	RegAsm.exe
Key created	\REGISTRY\USER\S-1-5-21-3751123196-3323558407-1869646069-1000\SOFTWARE\Microsoft\Office\15.0\Outlook\Profiles\Outlook	RegAsm.exe
Key queried	\REGISTRY\USER\S-1-5-21-3751123196-3323558407-1869646069-1000\SOFTWARE\Microsoft\Office\16.0\Outlook\Profiles\Outlook	RegAsm.exe
Key opened	\REGISTRY\USER\S-1-5-21-3751123196-3323558407-1869646069-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	RegAsm.exe
Key queried	\REGISTRY\USER\S-1-5-21-3751123196-3323558407-1869646069-1000\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	RegAsm.exe
Key opened	\REGISTRY\USER\S-1-5-21-3751123196-3323558407-1869646069-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	RegAsm.exe
Key queried	\REGISTRY\USER\S-1-5-21-3751123196-3323558407-1869646069-1000\SOFTWARE\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	RegAsm.exe
Key created	\REGISTRY\USER\S-1-5-21-3751123196-3323558407-1869646069-1000\SOFTWARE\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	RegAsm.exe
Key created	\REGISTRY\USER\S-1-5-21-3751123196-3323558407-1869646069-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	RegAsm.exe

Looks up external IP address via web service 1 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.

Processes:

flow ioc

31 api.ipify.org
Suspicious use of SetThreadContext 1 IoCs

Processes:

PO__2001.exe

description pid process target process

PID 2136 set thread context of 3472 2136 PO__2001.exe RegAsm.exe
Suspicious behavior: EnumeratesProcesses 6 IoCs

Processes:

PO__2001.exeRegAsm.exepowershell.exe

pid process

2136 PO__2001.exe
2136 PO__2001.exe
2136 PO__2001.exe
3472 RegAsm.exe
2388 powershell.exe
2388 powershell.exe
Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

PO__2001.exeRegAsm.exepowershell.exe

description pid process

Token: SeDebugPrivilege 2136 PO__2001.exe
Token: SeDebugPrivilege 3472 RegAsm.exe
Token: SeDebugPrivilege 2388 powershell.exe

flow	ioc
31	api.ipify.org

description	pid	process	target process
PID 2136 set thread context of 3472	2136	PO__2001.exe	RegAsm.exe

pid	process
2136	PO__2001.exe
2136	PO__2001.exe
2136	PO__2001.exe
3472	RegAsm.exe
2388	powershell.exe
2388	powershell.exe

description	pid	process
Token: SeDebugPrivilege	2136	PO__2001.exe
Token: SeDebugPrivilege	3472	RegAsm.exe
Token: SeDebugPrivilege	2388	powershell.exe

Suspicious use of WriteProcessMemory 14 IoCs

Processes:

PO__2001.exeRegAsm.execmd.exe

description	pid	process	target process
PID 2136 wrote to memory of 3472	2136	PO__2001.exe	RegAsm.exe
PID 2136 wrote to memory of 3472	2136	PO__2001.exe	RegAsm.exe
PID 2136 wrote to memory of 3472	2136	PO__2001.exe	RegAsm.exe
PID 2136 wrote to memory of 3472	2136	PO__2001.exe	RegAsm.exe
PID 2136 wrote to memory of 3472	2136	PO__2001.exe	RegAsm.exe
PID 2136 wrote to memory of 3472	2136	PO__2001.exe	RegAsm.exe
PID 2136 wrote to memory of 3472	2136	PO__2001.exe	RegAsm.exe
PID 2136 wrote to memory of 3472	2136	PO__2001.exe	RegAsm.exe
PID 3472 wrote to memory of 1880	3472	RegAsm.exe	cmd.exe
PID 3472 wrote to memory of 1880	3472	RegAsm.exe	cmd.exe
PID 3472 wrote to memory of 1880	3472	RegAsm.exe	cmd.exe
PID 1880 wrote to memory of 2388	1880	cmd.exe	powershell.exe
PID 1880 wrote to memory of 2388	1880	cmd.exe	powershell.exe
PID 1880 wrote to memory of 2388	1880	cmd.exe	powershell.exe

outlook_office_path 1 IoCs

Processes:

RegAsm.exe

description	ioc	process
Key queried	\REGISTRY\USER\S-1-5-21-3751123196-3323558407-1869646069-1000\SOFTWARE\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	RegAsm.exe

outlook_win_path 1 IoCs

Processes:

RegAsm.exe

description	ioc	process
Key queried	\REGISTRY\USER\S-1-5-21-3751123196-3323558407-1869646069-1000\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	RegAsm.exe

C:\Users\Admin\AppData\Local\Temp\PO__2001.exe
"C:\Users\Admin\AppData\Local\Temp\PO__2001.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2136
- C:\Users\Admin\AppData\Local\Temp\RegAsm.exe
  "C:\Users\Admin\AppData\Local\Temp\RegAsm.exe"
  2⤵
  - Executes dropped EXE
  - Checks computer location settings
  - Accesses Microsoft Outlook profiles
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  - outlook_office_path
  - outlook_win_path
  PID:3472
- - C:\Windows\SysWOW64\cmd.exe
    "cmd" /c start /b powershell Start-Sleep -Seconds 2; Remove-Item -path 'C:\Users\Admin\AppData\Local\Temp\RegAsm.exe' & exit
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:1880
  - - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
      powershell Start-Sleep -Seconds 2; Remove-Item -path 'C:\Users\Admin\AppData\Local\Temp\RegAsm.exe'
      4⤵
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:2388

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Credentials in Files

1

T1081

Discovery

Query Registry

1

T1012

System Information Discovery

1

T1082

Lateral Movement

Collection

Data from Local System

Email Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\RegAsm.exe

Filesize
63KB

MD5
0d5df43af2916f47d00c1573797c1a13

SHA1
230ab5559e806574d26b4c20847c368ed55483b0

SHA256
c066aee7aa3aa83f763ebc5541daa266ed6c648fbffcde0d836a13b221bb2adc

SHA512
f96cf9e1890746b12daf839a6d0f16f062b72c1b8a40439f96583f242980f10f867720232a6fa0f7d4d7ac0a7a6143981a5a130d6417ea98b181447134c7cfe2

Download Submit
C:\Users\Admin\AppData\Local\Temp\RegAsm.exe

Filesize
63KB

MD5
0d5df43af2916f47d00c1573797c1a13

SHA1
230ab5559e806574d26b4c20847c368ed55483b0

SHA256
c066aee7aa3aa83f763ebc5541daa266ed6c648fbffcde0d836a13b221bb2adc

SHA512
f96cf9e1890746b12daf839a6d0f16f062b72c1b8a40439f96583f242980f10f867720232a6fa0f7d4d7ac0a7a6143981a5a130d6417ea98b181447134c7cfe2

Download Submit
memory/1880-143-0x0000000000000000-mapping.dmp

Download
memory/2136-134-0x00000000074C0000-0x00000000074E2000-memory.dmp

Filesize
136KB

Download
memory/2136-131-0x0000000005ED0000-0x0000000006474000-memory.dmp

Filesize
5.6MB

Download
memory/2136-130-0x0000000000EB0000-0x0000000000FF2000-memory.dmp

Filesize
1.3MB

Download
memory/2136-132-0x00000000059C0000-0x0000000005A52000-memory.dmp

Filesize
584KB

Download
memory/2136-133-0x0000000005D90000-0x0000000005DD4000-memory.dmp

Filesize
272KB

Download
memory/2388-152-0x0000000007A90000-0x0000000007AB2000-memory.dmp

Filesize
136KB

Download
memory/2388-151-0x0000000007B30000-0x0000000007BC6000-memory.dmp

Filesize
600KB

Download
memory/2388-150-0x0000000006E10000-0x0000000006E2A000-memory.dmp

Filesize
104KB

Download
memory/2388-149-0x0000000008070000-0x00000000086EA000-memory.dmp

Filesize
6.5MB

Download
memory/2388-148-0x0000000006900000-0x000000000691E000-memory.dmp

Filesize
120KB

Download
memory/2388-147-0x0000000005970000-0x00000000059D6000-memory.dmp

Filesize
408KB

Download
memory/2388-144-0x0000000000000000-mapping.dmp

Download
memory/2388-145-0x00000000052A0000-0x00000000052D6000-memory.dmp

Filesize
216KB

Download
memory/2388-146-0x0000000005A40000-0x0000000006068000-memory.dmp

Filesize
6.2MB

Download
memory/3472-135-0x0000000000000000-mapping.dmp

Download
memory/3472-142-0x0000000006880000-0x00000000068D0000-memory.dmp

Filesize
320KB

Download
memory/3472-141-0x0000000006870000-0x000000000687A000-memory.dmp

Filesize
40KB

Download
memory/3472-140-0x00000000054E0000-0x0000000005546000-memory.dmp

Filesize
408KB

Download
memory/3472-139-0x0000000005080000-0x000000000511C000-memory.dmp

Filesize
624KB

Download
memory/3472-136-0x0000000000400000-0x00000000004A8000-memory.dmp

Filesize
672KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads